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diff --git a/storage/common/fileapi/file_system_util.h b/storage/common/fileapi/file_system_util.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef STORAGE_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_
+#define STORAGE_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_
+
+#include <string>
+#include <vector>
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "storage/common/fileapi/file_system_info.h"
+#include "storage/common/fileapi/file_system_types.h"
+#include "storage/common/quota/quota_types.h"
+#include "storage/common/storage_common_export.h"
+#include "third_party/WebKit/public/platform/WebFileError.h"
+#include "third_party/WebKit/public/platform/WebFileSystemType.h"
+
+class GURL;
+
+namespace storage {
+
+STORAGE_COMMON_EXPORT extern const char kPersistentDir[];
+STORAGE_COMMON_EXPORT extern const char kTemporaryDir[];
+STORAGE_COMMON_EXPORT extern const char kExternalDir[];
+STORAGE_COMMON_EXPORT extern const char kIsolatedDir[];
+STORAGE_COMMON_EXPORT extern const char kTestDir[];
+
+class STORAGE_COMMON_EXPORT VirtualPath {
+ public:
+  static const base::FilePath::CharType kRoot[];
+  static const base::FilePath::CharType kSeparator;
+
+  // Use this instead of base::FilePath::BaseName when operating on virtual
+  // paths. FilePath::BaseName will get confused by ':' on Windows when it
+  // looks like a drive letter separator; this will treat it as just another
+  // character.
+  static base::FilePath BaseName(const base::FilePath& virtual_path);
+
+  // Use this instead of base::FilePath::DirName when operating on virtual
+  // paths.
+  static base::FilePath DirName(const base::FilePath& virtual_path);
+
+  // Likewise, use this instead of base::FilePath::GetComponents when
+  // operating on virtual paths.
+  // Note that this assumes very clean input, with no leading slash, and
+  // it will not evaluate '..' components.
+  static void GetComponents(
+      const base::FilePath& path,
+      std::vector<base::FilePath::StringType>* components);
+
+  static void GetComponentsUTF8Unsafe(
+      const base::FilePath& path, std::vector<std::string>* components);
+
+  // Returns a path name ensuring that it begins with kRoot and all path
+  // separators are forward slashes /.
+  static base::FilePath::StringType GetNormalizedFilePath(
+      const base::FilePath& path);
+
+  // Returns true if the given path begins with kRoot.
+  static bool IsAbsolute(const base::FilePath::StringType& path);
+
+  // Returns true if the given path points to the root.
+  static bool IsRootPath(const base::FilePath& path);
+};
+
+// Parses filesystem scheme |url| into uncracked file system URL components.
+// Example: For a URL 'filesystem:http://foo.com/temporary/foo/bar',
+// |origin_url| is set to 'http://foo.com', |type| is set to
+// kFileSystemTypeTemporary, and |virtual_path| is set to 'foo/bar'.
+STORAGE_COMMON_EXPORT bool ParseFileSystemSchemeURL(
+    const GURL& url,
+    GURL* origin_url,
+    FileSystemType* type,
+    base::FilePath* virtual_path);
+
+// Returns the root URI of the filesystem that can be specified by a pair of
+// |origin_url| and |type|.  The returned URI can be used as a root path
+// of the filesystem (e.g. <returned_URI> + "/relative/path" will compose
+// a path pointing to the entry "/relative/path" in the filesystem).
+//
+// For Isolated filesystem this returns the 'common' root part, e.g.
+// returns URL without the filesystem ID.
+//
+// |type| needs to be public type as the returned URI is given to the renderer.
+STORAGE_COMMON_EXPORT GURL GetFileSystemRootURI(const GURL& origin_url,
+                                                       FileSystemType type);
+
+// Returns the name for the filesystem that is specified by a pair of
+// |origin_url| and |type|.
+// (The name itself is neither really significant nor a formal identifier
+// but can be read as the .name field of the returned FileSystem object
+// as a user-friendly name in the javascript layer).
+//
+// |type| needs to be public type as the returned name is given to the renderer.
+//
+// Example:
+//   The name for a TEMPORARY filesystem of "http://www.example.com:80/"
+//   should look like: "http_www.example.host_80:temporary"
+STORAGE_COMMON_EXPORT std::string
+GetFileSystemName(const GURL& origin_url, FileSystemType type);
+
+// Converts FileSystemType |type| to/from the StorageType |storage_type| that
+// is used for the unified quota system.
+// (Basically this naively maps TEMPORARY storage type to TEMPORARY filesystem
+// type, PERSISTENT storage type to PERSISTENT filesystem type and vice versa.)
+STORAGE_COMMON_EXPORT FileSystemType
+    QuotaStorageTypeToFileSystemType(storage::StorageType storage_type);
+
+STORAGE_COMMON_EXPORT storage::StorageType
+    FileSystemTypeToQuotaStorageType(FileSystemType type);
+
+// Returns the string representation of the given filesystem |type|.
+// Returns an empty string if the |type| is invalid.
+STORAGE_COMMON_EXPORT std::string
+GetFileSystemTypeString(FileSystemType type);
+
+// Sets type to FileSystemType enum that corresponds to the string name.
+// Returns false if the |type_string| is invalid.
+STORAGE_COMMON_EXPORT bool GetFileSystemPublicType(
+    std::string type_string,
+    blink::WebFileSystemType* type);
+
+// Encodes |file_path| to a string.
+// Following conditions should be held:
+//  - StringToFilePath(FilePathToString(path)) == path
+//  - StringToFilePath(FilePathToString(path) + "/" + "SubDirectory") ==
+//    path.AppendASCII("SubDirectory");
+//
+// TODO(tzik): Replace CreateFilePath and FilePathToString in
+// third_party/leveldatabase/env_chromium.cc with them.
+STORAGE_COMMON_EXPORT std::string FilePathToString(
+    const base::FilePath& file_path);
+
+// Decode a file path from |file_path_string|.
+STORAGE_COMMON_EXPORT base::FilePath StringToFilePath(
+    const std::string& file_path_string);
+
+// File error conversion
+STORAGE_COMMON_EXPORT blink::WebFileError
+FileErrorToWebFileError(base::File::Error error_code);
+
+// Generate a file system name for the given arguments. Should only be used by
+// platform apps.
+STORAGE_COMMON_EXPORT std::string GetIsolatedFileSystemName(
+    const GURL& origin_url,
+    const std::string& filesystem_id);
+
+// Find the file system id from |filesystem_name|. Should only be used by
+// platform apps. This function will return false if the file system name is
+// not of the form {origin}:Isolated_{id}, and will also check that there is an
+// origin and id present. It will not check that the origin or id are valid.
+STORAGE_COMMON_EXPORT bool CrackIsolatedFileSystemName(
+    const std::string& filesystem_name,
+    std::string* filesystem_id);
+
+// Validates the given isolated file system id.
+STORAGE_COMMON_EXPORT bool ValidateIsolatedFileSystemId(
+    const std::string& filesystem_id);
+
+// Returns the root URI for an isolated filesystem for origin |origin_url|
+// and |filesystem_id|. If the |optional_root_name| is given the resulting
+// root URI will point to the subfolder within the isolated filesystem.
+STORAGE_COMMON_EXPORT std::string GetIsolatedFileSystemRootURIString(
+    const GURL& origin_url,
+    const std::string& filesystem_id,
+    const std::string& optional_root_name);
+
+// Returns the root URI for an external filesystem for origin |origin_url|
+// and |mount_name|.
+STORAGE_COMMON_EXPORT std::string GetExternalFileSystemRootURIString(
+    const GURL& origin_url,
+    const std::string& mount_name);
+
+// Translates the net::Error to base::File::Error.
+STORAGE_COMMON_EXPORT base::File::Error
+NetErrorToFileError(int error);
+
+}  // namespace storage
+
+#endif  // STORAGE_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_